A) S-S bond is present in \[{{H}_{2}}{{S}_{2}}{{O}_{6}}.\]
B) In peroxosulphuric acid \[\left( {{H}_{2}}S{{O}_{5}} \right)\] sulphur is in \[+\,8\]oxidation state.
C) Copper powder along with \[A{{l}_{2}}{{O}_{3}}\] and \[{{K}_{2}}O\] is used as a catalyst in the preparation of \[N{{H}_{3}}\] by Haber?s process.
D) Change in enthalpy is positive for the preparation of \[S{{O}_{3}}\] by catalytic oxidation of \[S{{O}_{2}}.\]
Correct Answer: A
Solution :
\[H-O-\underset{O}{\overset{O}{\mathop{\underset{\parallel }{\overset{\parallel }{\mathop{S}}}\,}}}\,-\underset{O}{\overset{O}{\mathop{\underset{\parallel }{\overset{\parallel }{\mathop{S}}}\,}}}\,-O-H\] In \[{{H}_{2}}S{{O}_{5}}\] the oxidation number of O is +6 as two O are having peroxide bond.
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